# GPT-5.2 Codex vs Nemotron 3 Ultra

> GPT-5.2 Codex and Nemotron 3 Ultra score almost the same on the Noometry Index (42.6 vs 42.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-2-codex-vs-nemotron-3-ultra
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5.2 Codex leads 41.0 to 23.4.
- Nemotron 3 Ultra is cheaper at $0.50 / $2.20 per million input/output tokens, against $1.75 / $14 for GPT-5.2 Codex.
- GPT-5.2 Codex accepts more context: 400K tokens versus 262K.
- Nemotron 3 Ultra has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| Provider | OpenAI | NVIDIA |
| Noometry Index | 42.6 | 42.5 |
| Rank | 111 | 113 |
| Context | 400K | 262K |
| Input $/M | $1.75 | $0.50 |
| Output $/M | $14 | $2.20 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.2 Codex: 45.5 (#71)
- Nemotron 3 Ultra: 38.1 (#182)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| FrontierCode | — | 13.6% |
| SWE-bench Verified (bash only) | 72.8% | — |
| LMArena WebDev | 1339 | — |
| SWE-bench Multilingual | 66.3% | — |
| SciCode | — | 40.3% |
| WeirdML | — | 43.5% |
| LMArena Coding | — | 1468 |
| ALE-Bench | 1,300 | — |

## Agentic & Tool Use

- GPT-5.2 Codex: 41.0 (#22)
- Nemotron 3 Ultra: 23.4 (#126)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| Terminal-Bench | 66.5% | — |
| APEX-Agents | — | 22.7% |

## Reasoning

- GPT-5.2 Codex: —
- Nemotron 3 Ultra: 31.0 (#82)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| LMArena Hard Prompts | — | 1452 |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 90.1% |
| LMCA | — | 36.9% |
| Epoch Capabilities Index | — | 146.17 |

## Math

- GPT-5.2 Codex: —
- Nemotron 3 Ultra: 35.3 (#187)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| ProofBench | — | 2% |
| LMArena Math | — | 1457 |

## Knowledge

- GPT-5.2 Codex: —
- Nemotron 3 Ultra: 52.5 (#61)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| GPQA Diamond | — | 85.4% |
| LMArena Expert | — | 1472 |

## Multilingual

- GPT-5.2 Codex: —
- Nemotron 3 Ultra: 53.5 (#64)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| LMArena Non-English | — | 1427 |
| LMArena Chinese | — | 1497 |
| LMArena French | — | 1472 |
| LMArena German | — | 1471 |
| LMArena Korean | — | 1386 |
| LMArena Russian | — | 1417 |
| LMArena Spanish | — | 1454 |

## Instruction Following

- GPT-5.2 Codex: —
- Nemotron 3 Ultra: 74.7 (#88)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| LMArena Instruction Following | — | 1418 |

## Long Context

- GPT-5.2 Codex: —
- Nemotron 3 Ultra: 43.9 (#81)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| LMArena Longer Query | — | 1437 |

## Writing & Preference

- GPT-5.2 Codex: —
- Nemotron 3 Ultra: 66.3 (#36)

| Benchmark | GPT-5.2 Codex | Nemotron 3 Ultra |
|---|---|---|
| LMArena Text | — | 1445 |
| LMArena Creative Writing | — | 1398 |
| EQ-Bench Creative Writing | — | 1692 |
| LMArena Multi-Turn | — | 1411 |

## FAQ

### Is GPT-5.2 Codex better than Nemotron 3 Ultra?

GPT-5.2 Codex and Nemotron 3 Ultra score almost the same on the Noometry Index (42.6 vs 42.5), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.2 Codex or Nemotron 3 Ultra?

Nemotron 3 Ultra is cheaper. It lists at $0.50 per million input tokens and $2.20 per million output tokens; GPT-5.2 Codex lists at $1.75 and $14.

### Is GPT-5.2 Codex or Nemotron 3 Ultra better for coding?

GPT-5.2 Codex scores higher on coding benchmarks: 45.5 versus 38.1 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.2 Codex does, with 400K tokens against 262K.

### How many benchmarks do GPT-5.2 Codex and Nemotron 3 Ultra share?

0 benchmarks have published results for both models. GPT-5.2 Codex has 5 scored results on Noometry and Nemotron 3 Ultra has 30.